US4441659A - Arrangement in drum mills - Google Patents

Arrangement in drum mills Download PDF

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Publication number
US4441659A
US4441659A US06/207,795 US20779580A US4441659A US 4441659 A US4441659 A US 4441659A US 20779580 A US20779580 A US 20779580A US 4441659 A US4441659 A US 4441659A
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United States
Prior art keywords
pipe
grinding space
openings
mill
outer end
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Expired - Lifetime
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US06/207,795
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English (en)
Inventor
Olle E. Marklund
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Boliden AB
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Boliden AB
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Assigned to BOLIDEN AKTIEBOLAG, A ORGANIZATION OF SWEDEN reassignment BOLIDEN AKTIEBOLAG, A ORGANIZATION OF SWEDEN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MARKLUND OLLE E.
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details

Definitions

  • the present invention relates to an arrangement in drum mills for autogenous or semi-autogenous wet-grinding processes.
  • the material is classified so that said coarse material lies within a particle range, e.g. a smallest cross-dimension of about 25-80 mm, such as to enable said coarse material to be used as grinding media in a secondary autogenous mill for further grinding of the said fine material in which case the coarse material is passed to the secondary mill, optionally via a storage bin.
  • Material which has an intermediate particle size, e.g. a smallest cross-dimension of about 5-25 mm, and which cannot to advantage be further ground while using the coarse material as grinding media is normally passed through a screen and returned to the primary mill or passed to an intermediate mill, such as a rod mill, particularly suited for grinding such intermediate size material, from which mill ground material is passed to the secondary mill.
  • said means can be provided with means, whereby the removal of classified coarse material can be controlled, whereat means are also provided for returning coarse material taken out from the grinding space of the primary mill, but not taken out from the classifying means, back to said grinding space.
  • Arrangements of the aforedescribed kind require a lot of space and are subjected to a great deal of wear, since material mixture is constantly taken from the grinding space and must be classified together with all the fine material removed, irrespective of whether a large quantity of coarse material is removed from the primary mill, a small quantity or none at all.
  • the object of the invention is therefore to devise a new and beneficial arrangement, whereby all above-mentioned disadvantages are at least to a substantial degree eliminated.
  • the screening wall has at least one first group of relatively small grate openings through which fine material ground in the mill constantly leaves the grinding space and departs through the discharge trunnion, and at least one second group of relatively large openings through which mixed material, comprising both fine and coarse material, can leave the grinding space, said second group of openings communicating with an individual material outlet via switching means by which the material mixture passing through said second group of openings can be prevented from leaving the mill, and classifying means for dividing said material mixture upstream of the outlet therefore into at least one coarse fraction and at least one finer fraction having a maximum particle size which is equal to or greater than the maximum particle size of said fine material. Means are provided for returning at least the major part of said finer fraction to the grinding space.
  • said second group of openings discharge into a sector-shaped space which is defined by said screening wall, said end wall and substantially radially extending defining walls arranged therebetween, and which is connected at its radially inner end to a pipe arranged within said discharge trunnion substantially coaxially therewith.
  • the classifying means is formed by openings in the pipe wall, said openings discharging into a tubular part which encircles said pipe along at least a part of the length thereof and substantially coaxially therewith, and which has an open inner end discharging into said grinding space.
  • Said tubular part may be of a substantially conically flared configuration and/or may be provided on the inner surfaces thereof with helically extending strips, for promoting the return of the finer material fraction separated by the classifying means, back to the grinding space.
  • said pipe may be open at both ends and the sector-shaped space may connect with an inner end of the pipe which is open towards the grinding space via a valve which can be switched to guide said material mixture either into the pipe or directly into the grinding space.
  • said pipe may be closed at the end thereof facing the grinding space and be in constant communication with said sector-shaped space.
  • the tubular part may be open at its outer end, and the ends of said pipe and said tubular part remote from the grinding space may be arranged to co-operate with a deflecting means which can be switched between a first position in which the classified material mixture arriving through said pipe is passed axially beyond the outer end of said tubular part, and a second position in which said classified material mixture is prevented from reaching said outer end.
  • the deflecting means may comprise a chute which is swingably mounted on a stationary holder located externally of the outer end of said tubular part, for movement between a first position in which it passes classified material mixture from the outer end of the tubular part, and a second position in which it uncovers the outer end of the pipe so that the classified material mixture falls from the outer end of the pipe down into said tubular part for return to the grinding space.
  • FIG. 1 is an axial sectional view of part of the discharge end of an autogenous mill having an arrangement according to the invention.
  • FIG. 2 is a sectional view taken on the line II--II in FIG. 1.
  • FIG. 3 illustrates the deflecting means shown in FIG. 1, in larger scale and in a different position
  • FIG. 4 is an axial sectional view of another embodiment of the arrangement according to the invention.
  • FIGS. 1-3 which illustrate parts of the discharge end of a drum mill 10 intended for autogenous or semi-autogenous grinding
  • the references 11 and 12 identify respectively the end wall and shell of said mill at said discharge end.
  • the shell or outer wall of the mill is lined internally with a rubber lining 13 and a plurality of carrier devices 14, so-called lifters, which project above the lining 13 and which are also made of rubber.
  • the end wall 11 and other parts of the mill which come into contact with the material being ground are also lined with a wear resistant material, such as rubber.
  • the wall 18 is provided with a plurality of radially extending lifter elements 19 and defines, together with the webs 16 and the lining 15, a plurality of sector shaped spaces 20, 21 (FIG. 2).
  • the screening wall 18 is provided with groups of openings 22, 23, the openings 22, which are relatively small and of which only a few are shown in FIG.
  • the space 21 which receives material through the openings 23 forms a passage for leading said material mixture towards the central region of the end wall 11 and opens into a centrally arranged material-discharge pipe 25 via a switching means generally shown at 26, by means of which switching means the flow of said material mixture from the space 21 can be deflected so that it is returned, either completely or in part, back to the grinding space 24.
  • the pipe 25 shields the discharge flow of material mixture from the flow of fine material which is fed out of the grinding space 24 and which passes into the spaces 20 through the openings 22.
  • the spaces 20 also form passages for leading the fine material towards the central region of the end wall 11, and open into a mill-trunnion liner pipe 28 which is arranged in the hollow mill-trunnion 27 and substantially coaxially surrounds the pipe 25.
  • the pipe 25 extends axially beyond the pipe 28, and the pipes 25 and 28 open into mutually different discharge chutes or down-pipes 29 and 30 respectively of a stationary material-receiving device 31 connected to the discharge end of the mill trunnion 27, 28.
  • the reference 32 identifies part of a support which carries the mill 10 at its discharge end, via a bearing means 33.
  • a corresponding bearing means can be provided at the other end of the mill 10.
  • the mill may be carried by bearings arranged to co-act with bearing races on the outer wall 12 at the opposite ends thereof.
  • the switching means 26 illustrated in FIGS. 1-3 comprises a flap valve having a substantially rectangular valve flap 34 which is pivotally mounted along one edge thereof.
  • the flap 34 is hinged at 35 in a valve housing 36 formed in the inner end of pipe 25, said housing 36 communicating with the space 21 via a funnel-like part 37.
  • the flap 34 is pivotally connected to one end of a rod-like element 38, whose other end is connected to the piston rod of a pressure cylinder 39, via a coupling which permits the rod-like element 38 to rotate and pivot relative to the piston rod.
  • the rod-like element 38 extends freely through the pipe 25 between the flap 34 and the coupling 40.
  • the cylinder 39 is carried by the material receiving device 31, via a bracket structure 41.
  • the pipe 25 is provided along a substantial part of its length with throug-passing slots or openings 42, the smallest cross-sectional size of which is equal to or greater than the smallest cross-sectional size of the openings 22, but smaller than the smallest cross-sectional size of the openings 23.
  • the openings 42 open out into a tubular part 43 which encircles said pipe 25, substantially coaxially therewith, and which has an open inner end opening into the grinding space 24.
  • the removal of coarse material from the mill 10 will not disturb the grinding process in the mill, by a sudden or abrupt increase in rate of discharge of pulp comprising fine material and water therefrom, or disturb the grinding process in a possible subsequent mill (not shown) which is arranged immediately after the mill 10, and in which the fine material taken out continously through the openings 22 is further ground with grinding media in the form of the coarse material removed from the mill, by a sudden increase in the charge of pulp comprising fine material and water to such a subsequent mill.
  • the tubular part 43 is flared substantially conically in a direction towards the grinding space 24.
  • the inner surface of the part 43 may be provided with helically extending strips (not shown), for promoting the return of the finer fraction to the grinding space 24.
  • the tubular part 43 is suitably closed at its end remote from the grinding space 24, in the manner shown in FIG. 1.
  • the pipe 25 may also be provided, in the shown manner, with helical strips 54, for controlling the flow of coarse material to the downpipe 30.
  • the pipes 25 and 28, the valve housing 36 and the parts 37 and 43 form, to advantage, a unit which can be assembled externally of the mill and which can be inserted into the position shown in FIG. 1, and positioned by means of positioning means 50 in relation to the actual mill trunnion 27, and locked in position by means of locking devices 51.
  • the alternative embodiment illustrated in FIG. 4 has no flap valve, and the space 21 opens at its radially inner end into a funnel-like element 44, which in turn opens into a pipe 45 whose end remote from the grinding space is closed and its opposite end open.
  • the pipe 45 is encircled by a pipe 28, which receives the fine material flowing continuously from the spaces 20.
  • Extending coaxially with the pipes 45, 28 and arranged therebetween is a tubular part 46, which opens at both ends thereof. The inner end of tubular part 46 opens out into the grinding space 24, in order to return thereto the finer fraction of the mixed material arriving in the pipe 45 through the funnel-shaped element 44, said finer fraction being obtained from said mixed material through the openings 42 in the pipe 45.
  • the outer end of the pipe 45 terminates inwardly of the open, outer end of the tubular part 46, which in turn extends axially outwardly of the pipe 28 and is provided with helically extending strips 47, for promoting the return of material back to the grinding space of the mill.
  • a deflecting means in the form of a chute 48 which is pivotally mounted at 49 on a stationary holder (not shown) located externally of the outer end of the tubular part for movement between a first position in which the chute leads the mixed material classified by means of the openings 42 away from the outer end of the pipe 45, and a second position in which the chute exposes the outer end of said pipe 45, so that subsequent to said classification residual coarse material falls from the outer end of the pipe 45, down into the tubular part 46, for return to the grinding space.
  • the deflecting means can be arranged to close the funnel-shaped part 37 of the FIG. 1 embodiment or the outer end of the pipe 45 of the FIG. 4 embodiment when coarse material is not removed from the mill 10, and the discharge pipe 28 for fine material, as illustrated in FIG. 1, may be provided with helically extending strips 52, for assisting the discharge of fine material.
  • the pipe 25 for receiving said mixed material may be provided with additional openings (as shown at 53 in FIG.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
US06/207,795 1979-11-30 1980-11-17 Arrangement in drum mills Expired - Lifetime US4441659A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE7909921A SE426916B (sv) 1979-11-30 1979-11-30 Anordning vid trumkvarn for autogen eller semiautogen vatmalning
SE7909921 1979-11-30

Publications (1)

Publication Number Publication Date
US4441659A true US4441659A (en) 1984-04-10

Family

ID=20339450

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/207,795 Expired - Lifetime US4441659A (en) 1979-11-30 1980-11-17 Arrangement in drum mills

Country Status (20)

Country Link
US (1) US4441659A (sv)
JP (1) JPS5689851A (sv)
AU (1) AU535484B2 (sv)
BR (1) BR8007780A (sv)
CA (1) CA1150703A (sv)
DE (1) DE3044636C2 (sv)
DK (1) DK150563C (sv)
ES (1) ES8200238A1 (sv)
FI (1) FI66768C (sv)
FR (1) FR2470641A1 (sv)
GB (1) GB2064364B (sv)
GR (1) GR71919B (sv)
IT (1) IT1134339B (sv)
MX (1) MX152074A (sv)
NO (1) NO149880C (sv)
PH (1) PH20227A (sv)
PT (1) PT72099B (sv)
SE (1) SE426916B (sv)
SU (1) SU1313334A3 (sv)
ZA (1) ZA807185B (sv)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687672A (en) * 1983-11-07 1987-08-18 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and apparatus for preparing frozen free-flowing food particles
US5118043A (en) * 1988-04-05 1992-06-02 Olmar Ab Method and apparatus for autogenous comminution primarily of overcompetent, heterogeneous mineral material
US5814273A (en) * 1997-04-04 1998-09-29 Nielsen; Jack T. Trunnion liner apparatus
WO1999042217A1 (fr) * 1998-02-20 1999-08-26 Magotteaux International S.A. Broyeur travaillant en voie humide muni d'une cloison et cloison de sortie destinee au broyeur
US5975310A (en) * 1997-01-17 1999-11-02 Darling; Richard S. Method and apparatus for ball separation
WO2003065944A1 (en) 2002-02-08 2003-08-14 Hollister Incorporated Ostomy pouch with bias members and closure means
US6726667B2 (en) 2001-06-15 2004-04-27 Hollister Incorporated Drainable ostomy pouch and closure means therefor
US20050131360A1 (en) * 2002-04-10 2005-06-16 Hollister Incorporated Drainable ostomy pouch with integrated closure
US20090171311A1 (en) * 2007-12-28 2009-07-02 Aktivpak, Inc. Dispenser and therapeutic package suitable for administering a therapeutic substance to a subject, along with method relating to same
US20100179473A1 (en) * 2006-12-29 2010-07-15 Amir Genosar Hypodermic drug delivery reservoir and apparatus
CN101884949A (zh) * 2009-05-13 2010-11-17 波利科普公司 排放端内衬
US20110068207A1 (en) * 2008-05-27 2011-03-24 Robert Mepham Discharge end liner
US20110146933A1 (en) * 2008-08-01 2011-06-23 Page David J Unidirectional discharge grate assembly
WO2012015525A1 (en) 2010-07-26 2012-02-02 Hollister Incorporated Drainable ostomy pouch
CN103071568A (zh) * 2013-02-17 2013-05-01 山东天一化学股份有限公司 一种溴系阻燃剂的连续研磨方法及实现该方法的研磨机
US8821463B2 (en) 2009-03-17 2014-09-02 Hollister Incorporated Drainable ostomy pouch
US9289775B2 (en) 2012-11-22 2016-03-22 Polycorp Ltd. Discharge grate assembly
CN107282278A (zh) * 2017-08-23 2017-10-24 中冶北方（大连）工程技术有限公司 一种自磨机/半自磨机排料分流装置
US10456884B2 (en) 2016-05-19 2019-10-29 Polycorp Ltd. Liner system for a mill shell

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE429303B (sv) * 1981-11-27 1983-08-29 Boliden Ab Forfarande vid autogen malning
LU85767A1 (fr) * 1985-02-08 1986-09-02 Communition Tech Comminutec Dispositif de reglage du temps de retention du materiau dans un broyeur
AU601053B2 (en) * 1987-07-07 1990-08-30 Bruce Maddison Apparatus for noble metal recovery
JPS6414679U (sv) * 1987-07-16 1989-01-25
JPS6414678U (sv) * 1987-07-16 1989-01-25

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same
US3231203A (en) * 1962-01-29 1966-01-25 Koppers Co Inc Grinding mill and process
SU417164A1 (sv) * 1972-05-12 1974-02-28
US3924814A (en) * 1974-02-27 1975-12-09 Boliden Ab Arrangement in grinding mills

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3078050A (en) * 1960-01-08 1963-02-19 Hardinge Harlowe Autogenous grinding process and mill systems to perform the same
US3231203A (en) * 1962-01-29 1966-01-25 Koppers Co Inc Grinding mill and process
SU417164A1 (sv) * 1972-05-12 1974-02-28
US3924814A (en) * 1974-02-27 1975-12-09 Boliden Ab Arrangement in grinding mills

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687672A (en) * 1983-11-07 1987-08-18 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Method and apparatus for preparing frozen free-flowing food particles
US5118043A (en) * 1988-04-05 1992-06-02 Olmar Ab Method and apparatus for autogenous comminution primarily of overcompetent, heterogeneous mineral material
US5975310A (en) * 1997-01-17 1999-11-02 Darling; Richard S. Method and apparatus for ball separation
US5814273A (en) * 1997-04-04 1998-09-29 Nielsen; Jack T. Trunnion liner apparatus
WO1999042217A1 (fr) * 1998-02-20 1999-08-26 Magotteaux International S.A. Broyeur travaillant en voie humide muni d'une cloison et cloison de sortie destinee au broyeur
US6726667B2 (en) 2001-06-15 2004-04-27 Hollister Incorporated Drainable ostomy pouch and closure means therefor
US7879016B2 (en) 2002-02-08 2011-02-01 Hollister Incorporated Ostomy pouch with bias members and closure means
US6887222B2 (en) 2002-02-08 2005-05-03 Hollistser Incorporated Ostomy pouch with bias members and closure means
WO2003065944A1 (en) 2002-02-08 2003-08-14 Hollister Incorporated Ostomy pouch with bias members and closure means
US20060015079A1 (en) * 2002-02-08 2006-01-19 Hollister Incorporated Ostomy pouch with bias members and closure means
EP2050419A2 (en) 2002-02-08 2009-04-22 Hollister Incorporated Ostomy pouch with bias members and closure means
US9629744B2 (en) 2002-04-10 2017-04-25 Hollister Incorporated Drainable ostomy pouch with integrated closure
US20050131360A1 (en) * 2002-04-10 2005-06-16 Hollister Incorporated Drainable ostomy pouch with integrated closure
US7879015B2 (en) 2002-04-10 2011-02-01 Hollister Incorporated Drainable ostomy pouch with integrated closure
US20110144601A1 (en) * 2002-04-10 2011-06-16 Hollister Incorporated Drainable Ostomy Pouch With Integrated Closure
US20100179473A1 (en) * 2006-12-29 2010-07-15 Amir Genosar Hypodermic drug delivery reservoir and apparatus
US8684968B2 (en) 2006-12-29 2014-04-01 Aktivpak, Inc. Hypodermic drug delivery reservoir and apparatus
US20090171311A1 (en) * 2007-12-28 2009-07-02 Aktivpak, Inc. Dispenser and therapeutic package suitable for administering a therapeutic substance to a subject, along with method relating to same
US8663188B2 (en) 2007-12-28 2014-03-04 Aktivpak, Inc. Dispenser and therapeutic package suitable for administering a therapeutic substance to a subject, along with method relating to same
US20110068207A1 (en) * 2008-05-27 2011-03-24 Robert Mepham Discharge end liner
US8360350B2 (en) 2008-05-27 2013-01-29 Polycorp Ltd. Discharge end liner
US20110146933A1 (en) * 2008-08-01 2011-06-23 Page David J Unidirectional discharge grate assembly
US8308906B2 (en) 2008-08-01 2012-11-13 Polycorp Ltd. Unidirectional discharge grate assembly
US8821463B2 (en) 2009-03-17 2014-09-02 Hollister Incorporated Drainable ostomy pouch
CN101884949A (zh) * 2009-05-13 2010-11-17 波利科普公司 排放端内衬
US8672907B2 (en) 2010-07-26 2014-03-18 Hollister Incorporated Drainable ostomy pouch
WO2012015525A1 (en) 2010-07-26 2012-02-02 Hollister Incorporated Drainable ostomy pouch
US9289775B2 (en) 2012-11-22 2016-03-22 Polycorp Ltd. Discharge grate assembly
CN103071568A (zh) * 2013-02-17 2013-05-01 山东天一化学股份有限公司 一种溴系阻燃剂的连续研磨方法及实现该方法的研磨机
US10456884B2 (en) 2016-05-19 2019-10-29 Polycorp Ltd. Liner system for a mill shell
CN107282278A (zh) * 2017-08-23 2017-10-24 中冶北方（大连）工程技术有限公司 一种自磨机/半自磨机排料分流装置

Also Published As

Publication number Publication date
DE3044636C2 (de) 1986-07-10
GB2064364B (en) 1983-07-20
GB2064364A (en) 1981-06-17
PT72099A (en) 1980-12-01
CA1150703A (en) 1983-07-26
FR2470641B1 (sv) 1984-11-30
JPS5689851A (en) 1981-07-21
SU1313334A3 (ru) 1987-05-23
DK500780A (da) 1981-05-31
FI803679L (fi) 1981-05-31
IT8026070A0 (it) 1980-11-19
ZA807185B (en) 1981-11-25
SE7909921L (sv) 1981-05-31
ES497246A0 (es) 1981-10-16
JPS615775B2 (sv) 1986-02-21
NO149880C (no) 1984-07-25
ES8200238A1 (es) 1981-10-16
FI66768B (fi) 1984-08-31
DK150563B (da) 1987-03-30
GR71919B (sv) 1983-08-17
NO149880B (no) 1984-04-02
MX152074A (es) 1985-05-28
AU6490780A (en) 1982-06-10
AU535484B2 (en) 1984-03-22
IT1134339B (it) 1986-08-13
PH20227A (en) 1986-10-23
BR8007780A (pt) 1981-06-16
DK150563C (da) 1987-10-12
FR2470641A1 (fr) 1981-06-12
PT72099B (en) 1981-11-02
FI66768C (fi) 1984-12-10
SE426916B (sv) 1983-02-21
NO803475L (no) 1981-06-01
DE3044636A1 (de) 1981-08-27

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